Pipe-coupling



Imran STATES SOLOMON Rl DRESSER, OF BRADFORD, PENNSYLVANIA.

PmE-couPLiNc.

Y SPECIFICATION foimingpart of 4llletters Patent No. 389,797, dated September 18, 1888.

Application filed March 19,1887. Serial No. 231,396.

(No model.)

vT0 all whom it 11i/ty concern:

Beit known that I, SOLOMON R. DnnssER, a citizen of theUnit-ed States, residing at Bradford, in the couutyof McKean and State of Pennsylvania, have invented anew and useful Improvement in Pipe-Couplings, of which the following is a specification, such as will enable Others skilled in the art to which it appertains to make and use the same.

The object of my invention is to provide a perfectly tight coupling for plain end pipe, and to provide for expansion and contraction without using the force or pressure of the gas or liquid conveyed in the pipe, as shown iu my application filed February 26, 1887, seriesV 0f 1880, No. 229,030.

The main feature or difference in this invention from the one referred t'o above is that instead -of .using twg one, and dispense with the rubber gasket H,

l 'and omit utilizing the force or pressure of the l compressing the elastic material conveyed in the pipes to assist in packing by using mechanical means only The figure is a vertical longitudinal section of'iny coupliny.

-This coupling is put together the same as shown in Fig. 2in my application ol' February 26, 1887, referred to above.

In joining pipes with this coupling, section l I3 ot coupling is slipped over pipe A. The

' coupling, and the nuts 45 l with leach other;n then y against the elastic elastic packing-E is then slipped on pipe A.

i slipped on the p1' pc A the center of loose ring C; then the other 'section of pipe-cdupling, B', is slipped on the cn'd of pipe A', then theelastic packing E' is slipped en pipe A; then the end of pipe A 1s put* into loose ring C so it'willV nearly, but not quite, abut the end of pipe `A, audio line thcsectonsB and B of con'plinga-re .drawn together, the bolts are put in the holes provided in the outer rirn'of ulre put onthe bolts and screwed up,which 'draws the sections of`coup ling together and forces the loose ring C packingslE and E', packi ing them tightly to thel pipes-and sections of coupling B and B', and at the same timethe Velastic packing-rings 113 and Ef are packed loose-rings I use only" to com press said packing.

compression-ring', forces exerted upon the' compressible rings tigh'tiy to the ends of loose ring` C, thus maltA ing aperfectly tight packing at all exposed points of escape. This method of joining pipes makes a perfeetlytight coupling, and at the same time provides for expansion and contraction, as cach section of the pipe can contract or expandwithout having any effect or iniiuence on the other section, because the pipes can slip in the packingrihgs E and E.

Expansion is provided for by not abutting the ends of pipe when being laid. Leaving them apart from one-half Yto three-fourths of an inch in the loose ring @allows them to lengtlu toward each other without the one crovvdin, the other.

y I am aware that pipe-couplings formed of two sections andhaving a metallic compress ing-rinrI iuclosed by section and placed between-the ends of the ycompressiugr-ring and the insideV of', the sections, so that when the sections are drawn togethcr by means of bolts the rubber rings will be compressed againstthe sideof the pipes to be coupled, are old. My device differs fromv such construction in that inthe latter a uniform pressure along the face is. impossible, as it is well yknown that rubber rings, whether square or round in cross-section, if compressed by pressing upon the ends, wili have the greatest expansion 'at their peripheral center and w'ard the ends. I am also aware that similar couplings have been provided with compressible rings embedded in a groove in theouter surface of the pipes and a compressing-ring having,r semi-annular recesses in its ends for therings. Such construction produces sub stantially the same'result as the ring which is square in cross-section, butin a less degree,

whereas in my device the inner faces of the couplings are curved; the compressing-ring has wedge-shaped endsand ,the compressible rings conform 4'to the! shape of the space between the inner face of tlie'ysectionsrand the sc that the resultant of the will cause a uniform pressure of the inner face of the ring` against the pipes to be coupled.

Therefore what I claim as new isf thevscctions andpruhber. rings or packings which are, square in crossgradually decreasing expansion to- IOO A pipe-coupling mac in Lw@ sections, the g 'In Lestinwnytlmtduim thc blgoingzwmy inner faces 0f which re curved,m1 having a ovm have hel-@i0 ufixcd my sglmmx'e in 'pms compressing -ring with4 wedge -shaped omis, @nos of iw@ witnessus. andComplssibleiingsuonbrming to i'heshnpc SOLOMON R. DRESSER. 0l' und jtbing' within the Spa@ between i110 Winesss: inner faces of the sections :1nd ih@ Compress i G. W. (bissl-1m', i11g1ng, snbsmminlly ns (ui'scrwd, 421cm. SXHTH. 

